[remove datanode] Fix IoTDBRemoveDataNodeNormalIT apache#15429

Author: HxpSerein

iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/manager/load/balancer/region/GreedyCopySetRegionGroupAllocator.java

@@ -138,9 +138,7 @@ public Map<TConsensusGroupId, TDataNodeConfiguration> removeNodeReplicaSelect(
     try {
       // 1. prepare: compute regionCounter, databaseRegionCounter, and combinationCounter
 
-      List<TRegionReplicaSet> databaseAllocatedRegionGroups =
-          new ArrayList<>(databaseAllocatedRegionGroupMap.values()).get(0);
-      prepare(availableDataNodeMap, allocatedRegionGroups, databaseAllocatedRegionGroups);
+      prepare(availableDataNodeMap, allocatedRegionGroups, Collections.emptyList());
       computeInitialDbLoad(databaseAllocatedRegionGroupMap);
 
       // 2. Build allowed candidate set for each region that needs to be migrated.

iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/procedure/env/RemoveDataNodeHandler.java

@@ -38,7 +38,7 @@
 import org.apache.iotdb.confignode.consensus.request.write.datanode.RemoveDataNodePlan;
 import org.apache.iotdb.confignode.consensus.response.datanode.DataNodeToStatusResp;
 import org.apache.iotdb.confignode.manager.ConfigManager;
-import org.apache.iotdb.confignode.manager.load.balancer.region.GreedyRegionGroupAllocator;
+import org.apache.iotdb.confignode.manager.load.balancer.region.GreedyCopySetRegionGroupAllocator;
 import org.apache.iotdb.confignode.manager.load.balancer.region.IRegionGroupAllocator;
 import org.apache.iotdb.confignode.manager.load.cache.node.NodeHeartbeatSample;
 import org.apache.iotdb.confignode.manager.load.cache.region.RegionHeartbeatSample;
@@ -83,14 +83,14 @@ public RemoveDataNodeHandler(ConfigManager configManager) {
 
     switch (ConfigNodeDescriptor.getInstance().getConf().getRegionGroupAllocatePolicy()) {
       case GREEDY:
-        this.regionGroupAllocator = new GreedyRegionGroupAllocator();
+        this.regionGroupAllocator = new GreedyCopySetRegionGroupAllocator();
         break;
       case PGR:
-        this.regionGroupAllocator = new GreedyRegionGroupAllocator();
+        this.regionGroupAllocator = new GreedyCopySetRegionGroupAllocator();
         break;
       case GCR:
       default:
-        this.regionGroupAllocator = new GreedyRegionGroupAllocator();
+        this.regionGroupAllocator = new GreedyCopySetRegionGroupAllocator();
     }
   }